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| Patents for Le Roi Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,620,917 | Mar. 15, 1927 | C.W. Pendock | Internal-Combustion engine | cooling apparatus | |
| 1,734,181 | Nov. 25, 1929 | C.W. Pendock | Internal-Combustion Engine | internal combustion engines | |
| 1,970,371 | Aug. 14, 1934 | J.R. Frantz | Air Compressor Engine | internal combustion engines | |
| 2,003,351 | Jun. 04, 1935 | P.E. Eells | Power Control | hydraulic machinery | |
| 2,380,226 | Jul. 10, 1945 | J.R. Frantz | Automatic Compressor Regulator | air compressor controllers | |